Mute- Answer Any key- Last 10 number redial- Voicemail waiting indicator- Quick access key for voicemail box- English/Spanish/French setup menu- Adjust the volume up or down to best suit your needs- Accessory handset only-requires a CL82115, CL82215, CL82315, CL82415, CL82465, CL82515, CL83215, CL83315, CL83365, CL83415, CL83465, CL83565, CL84115, CL84215, CL84265, or CL84365 to operate- Enlarged font and extra-large, backlit keys make the keypad easy to use. This feature is especially helpful for those who are visually impaired.- ECO mode manages power consumption so the system uses less energy and you get the best battery life.- Silence the ringer on the handset and base for just a moment or for an extended period of time.- Input and/or save up to 20 names and numbers in the call block directory to stop unwanted calls from ringing through Caller ID subscription Required.- AT&T DECT 6.0 products provide unsurpassed range and clarity thanks to a unique antenna design and noise-filtering technology. This means phones that perform 45 percent better than the competition in lab tests-and the confidence you can take a call in the intercom between handsets- Conference between an outside line and up to 4 cordless handsets- Program up to 50 names and associated phone numbers in the handset. Quickly access the directory entries by scrolling alphabetically or by entering the first letter of a name